National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Monitor Stage: N/A Flood Stage: 8.0 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2021
1,410
5.02
May 7, 2021
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
2018
8,060
10.09
Apr 7, 2018
2017
5,210
8.45
Jun 20, 2017
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Mostly sunny. A 20 percent chance of rain late in the afternoon. Highs 47 to 53. East winds up to 10 mph shifting to the south in the afternoon.

Tonight: Windy. Rain and snow in the evening, then rain, snow and slight chance of thunderstorms after midnight. Precipitation may be heavy at times. Snow accumulation up to 13 inches. Lows 28 to 34. South winds 15 to 25 mph shifting to the southwest 20 to 30 mph after midnight. Gusts up to 45 mph. Chance of precipitation near 100 percent.

Sunday: Colder. Snow and rain in the morning, then snow showers in the afternoon. Snow may be heavy at times. Snow accumulation up to 10 inches. Total snow accumulation up to 23 inches. Snow level 4100 feet. Near steady temperature in the lower 30s. Southwest winds 5 to 15 mph. Chance of precipitation near 100 percent.

Sunday Night: Colder. Mostly cloudy in the evening then clearing. Lows 20 to 26. Northeast winds up to 10 mph.

Monday: Sunny. Highs 40 to 46. Northeast winds 5 to 10 mph shifting to the northwest in the afternoon.

Monday Night through Wednesday Night: Mostly clear. Lows 29 to 37. Highs 46 to 53.

Thursday through Friday: Mostly clear. Highs 51 to 58. Lows 33 to 39.
Impacts - E19 Information
7.0 FeetCampgrounds at North Pines and Housekeeping Camp begin to flood.
9.5 FeetSubstantial road flooding occurs at Sentinel Crossover, Wosky Pond, and Chapel Meadow. Water is approximately one foot deep on the road through Chapel Meadow.
10.0 FeetNorthside and Southside Drive are impassable to vehicles. Water comes 1.5 feet up the side of the Yosemite Creek Lift Station and 1 to 2 inches above the foundation of pumps that control the Housekeeping Camp Lift Station. Water flows two feet over the "swinging bridge".
13.27 FeetFlood of record - January 2, 1997.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.